diff --git a/japanese/canna-server/Makefile b/japanese/canna-server/Makefile
index 9ad0366db1f2..b7f82ec63a85 100644
--- a/japanese/canna-server/Makefile
+++ b/japanese/canna-server/Makefile
@@ -24,6 +24,12 @@ MAKE_JOBS_UNSAFE=	yes
 
 OPTIONS_DEFINE=	DOCS
 
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400091 || ( ${OSVERSION} >= 1302507 && ${OSVERSION} < 1400000 ))
+MAKE_ARGS+=	CCOPTIONS="-Wno-error=int-conversion"
+.endif
+
 post-install:
 	@cd ${INSTALL_WRKSRC} && ${SETENV} ${MAKE_ENV} ${MAKE} ${MAKE_FLAGS} \
 	    ${MAKEFILE} ${MAKE_ARGS} install.man